Add project files.

pe-packer/asmjit/core/osutils.cpp

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+// This file is part of AsmJit project <https://asmjit.com>
+//
+// See asmjit.h or LICENSE.md for license and copyright information
+// SPDX-License-Identifier: Zlib
+
+#include "../core/api-build_p.h"
+#include "../core/osutils_p.h"
+#include "../core/support.h"
+
+#if defined(_WIN32)
+  #include <atomic>
+#else
+  #include <fcntl.h>
+  #include <unistd.h>
+  #if defined(__APPLE__)
+    #include <mach/mach_time.h>
+  #else
+    #include <time.h>
+  #endif
+#endif
+
+ASMJIT_BEGIN_NAMESPACE
+
+uint32_t OSUtils::getTickCount() noexcept {
+#if defined(_WIN32)
+  enum HiResStatus : uint32_t {
+    kHiResUnknown      = 0,
+    kHiResAvailable    = 1,
+    kHiResNotAvailable = 2
+  };
+
+  static std::atomic<uint32_t> _hiResStatus(kHiResUnknown);
+  static volatile double _hiResFreq(0);
+
+  uint32_t status = _hiResStatus.load();
+  LARGE_INTEGER now, qpf;
+
+  if (status != kHiResNotAvailable && ::QueryPerformanceCounter(&now)) {
+    double freq = _hiResFreq;
+    if (status == kHiResUnknown) {
+      // Detects the availability of high resolution counter.
+      if (::QueryPerformanceFrequency(&qpf)) {
+        freq = double(qpf.QuadPart) / 1000.0;
+        _hiResFreq = freq;
+        _hiResStatus.compare_exchange_strong(status, kHiResAvailable);
+        status = kHiResAvailable;
+      }
+      else {
+        // High resolution not available.
+        _hiResStatus.compare_exchange_strong(status, kHiResNotAvailable);
+      }
+    }
+
+    if (status == kHiResAvailable)
+      return uint32_t(uint64_t(int64_t(double(now.QuadPart) / freq)) & 0xFFFFFFFFu);
+  }
+
+  // Bail to `GetTickCount()` if we cannot use high resolution.
+  return ::GetTickCount();
+#elif defined(__APPLE__)
+  // See Apple's QA1398.
+  static mach_timebase_info_data_t _machTime;
+
+  uint32_t denom = _machTime.denom;
+  if (ASMJIT_UNLIKELY(!denom)) {
+    if (mach_timebase_info(&_machTime) != KERN_SUCCESS || !(denom = _machTime.denom))
+      return 0;
+  }
+
+  // `mach_absolute_time()` returns nanoseconds, we want milliseconds.
+  uint64_t t = mach_absolute_time() / 1000000u;
+  t = (t * _machTime.numer) / _machTime.denom;
+  return uint32_t(t & 0xFFFFFFFFu);
+#elif defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
+  struct timespec ts;
+  if (ASMJIT_UNLIKELY(clock_gettime(CLOCK_MONOTONIC, &ts) != 0))
+    return 0;
+
+  uint64_t t = (uint64_t(ts.tv_sec ) * 1000u) + (uint64_t(ts.tv_nsec) / 1000000u);
+  return uint32_t(t & 0xFFFFFFFFu);
+#else
+  #pragma message("[asmjit] OSUtils::getTickCount() doesn't have implementation for the target OS.")
+  return 0;
+#endif
+}
+
+#if !defined(_WIN32)
+Error OSUtils::readFile(const char* name, String& dst, size_t maxSize) noexcept {
+  char* buffer = dst.prepare(String::ModifyOp::kAssign, maxSize);
+  if (ASMJIT_UNLIKELY(!buffer))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  int fd = ::open(name, O_RDONLY);
+  if (fd < 0) {
+    dst.clear();
+    return DebugUtils::errored(kErrorFailedToOpenFile);
+  }
+
+  intptr_t len = ::read(fd, buffer, maxSize);
+  if (len >= 0) {
+    buffer[len] = '\0';
+    dst._setSize(size_t(len));
+  }
+
+  ::close(fd);
+  return kErrorOk;
+}
+#endif
+
+ASMJIT_END_NAMESPACE